tests/test.sh exit code (0 → resolved); the classification below is post-hoc and cannot change it.module TopModule (
input wire clk,
input wire rst_n,
input wire start,
input wire [127:0] block_in,
input wire [127:0] round_key0,
input wire [3:0] num_rounds,
input wire reseed,
input wire [3:0] reseed_round,
output reg ready,
output reg result_valid,
output reg [127:0] block_out
);
// Engine registers
reg [127:0] state;
reg [127:0] rkey;
reg [3:0] nrounds;
reg [3:0] round_index; // number of completed rounds / current round index
reg [4:0] slot; // 0..15 byte slots, 16 = key-mix slot
reg [7:0] start_fb; // current round's start feedback
reg [7:0] prev_byte; // previous slot's produced byte
reg busy;
// Combinational datapath for the current byte slot
wire [3:0] bidx = {slot[3:2], ~slot[1:0]}; // byte index within 128-bit word
wire [6:0] base = {bidx, 3'b000}; // bidx * 8
wire [7:0] cur = state[base +: 8]; // current byte at this slot
wire [7:0] fb = (slot == 5'd0) ? start_fb : prev_byte;
wire [7:0] xr = cur ^ fb;
wire [7:0] newb = {xr[6:0], xr[7]} ^ 8'h63; // rol1(byte^fb) ^ 0x63
wire [127:0] mixstate = state ^ rkey; // key-mix result
always @(posedge clk) begin
if (!rst_n) begin
ready <= 1'b1;
result_valid <= 1'b0;
block_out <= 128'b0;
busy <= 1'b0;
slot <= 5'b0;
round_index <= 4'b0;
end else begin
if (!busy) begin
if (start) begin
// Load a new operation (ready is high here)
state <= block_in;
rkey <= round_key0;
nrounds <= num_rounds;
round_index <= 4'b0;
slot <= 5'b0;
start_fb <= 8'b0; // {4'b0, round_index=0}
prev_byte <= 8'b0;
busy <= 1'b1;
ready <= 1'b0;
result_valid <= 1'b0;
end
// else: stay idle; ready/result_valid/block_out hold
end else begin
if (slot < 5'd16) begin
// Byte slot: replace only its byte
state[base +: 8] <= newb;
prev_byte <= newb;
slot <= slot + 5'b1;
end else begin
// Key-mix slot
if (round_index + 4'b1 == nrounds) begin
// Finishing slot of the operation
block_out <= mixstate;
result_valid <= 1'b1;
ready <= 1'b1;
busy <= 1'b0;
slot <= 5'b0;
end else begin
// Advance to next round; fix its start feedback here
state <= mixstate;
round_index <= round_index + 4'b1;
start_fb <= reseed ? {4'b0, reseed_round}
: {4'b0, round_index};
slot <= 5'b0;
end
end
end
end
end
endmodule
Check Verilog compiles
(which iverilog && iverilog -g2012 -o /tmp/dut_test dut.sv -s TopModule 2>&1 && echo "COMPILE_OK") || echo "iverilog not available"
/usr/bin/iverilog COMPILE_OK [stdout] /usr/bin/iverilog COMPILE_OK
Run simulation testbench
cat > /tmp/tb.sv <<'EOF'
module tb;
reg clk=0, rst_n=0, start=0, reseed=0;
reg [127:0] block_in, round_key0;
reg [3:0] num_rounds, reseed_round;
wire ready, result_valid;
wire [127:0] block_out;
TopModule d(.clk(clk),.rst_n(rst_n),.start(start),.block_in(block_in),
.round_key0(round_key0),.num_rounds(num_rounds),.reseed(reseed),
.reseed_round(reseed_round),.ready(ready),.result_valid(result_valid),.block_out(block_out));
always #5 clk=~clk;
task run; begin
@(posedge clk); #1; start=1; @(posedge clk); #1; start=0;
wait(result_valid && ready);
@(posedge clk); #1;
$display("RESULT %032x", block_out);
end endtask
initial begin
rst_n=0; @(posedge clk); #1; rst_n=1;
block_in=128'h00112233445566778899aabbccddeeff;
round_key0=128'h0f0e0d0c0b0a09080706050403020100;
num_rounds=1; reseed=0; reseed_round=0; run;
num_rounds=4; reseed=0; run;
num_rounds=4; reseed=1; reseed_round=4'd9; run;
$finish;
end
endmodule
EOF
iverilog -g2012 -o /tmp/sim /app/dut.sv /tmp/tb.sv && vvp /tmp/simRESULT c6dc8f0c1feb655ddfe7f0fbf92fe555 RESULT 19c8299774cd36782015430aee1999a8 RESULT fe03a49c0a71eec8c7dece0190a54118 /tmp/tb.sv:24: $finish called at 1626 (1s) [stdout] RESULT c6dc8f0c1feb655ddfe7f0fbf92fe555 RESULT 19c8299774cd36782015430aee1999a8 RESULT fe03a49c0a71eec8c7dece0190a54118 /tmp/tb.sv:24: $finish called at 1626 (1s)
Python reference model
python3 <<'EOF'
def rol1(b): return ((b<<1)|(b>>7))&0xff
def engine(block, key, nrounds, reseed=0, reseed_round=0):
state=list(block.to_bytes(16,'big')) # state[0]=MSByte = bits[127:120] = byte index15
# our byte index k = bits[8k+7:8k]; big-endian list index i -> byte number 15-i
# build access by byte-number
def get(bn): return state[15-bn]
def setb(bn,v): state[15-bn]=v
round_index=0
start_fb=0 # {0,round_index=0}
for r in range(nrounds):
prev=0
for s in range(16):
bidx=( (s>>2)<<2 ) | (3-(s&3)) # 4*(s/4)+(3-s%4)
cur=get(bidx)
fb=start_fb if s==0 else prev
nb=rol1(cur^fb)^0x63
setb(bidx,nb); prev=nb
# key-mix
v=int.from_bytes(bytes(state),'big')^key
state=list(v.to_bytes(16,'big'))
if round_index+1==nrounds:
return v
else:
start_fb= reseed_round if reseed else round_index
round_index+=1
return int.from_bytes(bytes(state),'big')
bi=0x00112233445566778899aabbccddeeff
k =0x0f0e0d0c0b0a09080706050403020100
for nr,rs,rr in [(1,0,0),(4,0,0),(4,1,9)]:
print("%032x"%engine(bi,k,nr,rs,rr))
EOFc6dc8f0c1feb655ddfe7f0fbf92fe555 19c8299774cd36782015430aee1999a8 fe03a49c0a71eec8c7dece0190a54118 [stdout] c6dc8f0c1feb655ddfe7f0fbf92fe555 19c8299774cd36782015430aee1999a8 fe03a49c0a71eec8c7dece0190a54118
No file changes, the agent left the workspace untouched.
TEST dut_present: PASS (/app/dut.sv exists)
TEST dut_forbidden: PASS (no forbidden constructs)
TEST dut_elaborates: PASS (DUT elaborates standalone)
TEST dut_compiles: PASS (compiled with held-back reference/testbench)
TEST simulation_completed: PASS (Mismatches: 8892 in 16537 samples)
TEST reference_equivalence: FAIL (8892 mismatches in 16537 samples)
{"score": 0.000000, "results_file": "/tmp/h2t-grader-home.OjOJMs/runtime/cb_verifier_317-19801-10573-32634_317/results.jsonl"}Reproduce this trial: git checkout 2f94510 && PYTHONPATH=src python3 scripts/build_site.py , then open trial/trial_42b0ab7abb25446a. Re-running the agent live requires EVAL_PLATFORM_ENABLE_OAUTH_SMOKE=1 and is non-deterministic.
Trial trial_42b0ab7abb25446a · verifier authoritative; classifier explanatory.